Tool-shank.



G. F. SULLIVAN.

TOOL SHANK.

APPLICATION FILED SEPT. 14, 1908.

Patented July 13, 1909.

UNTTED STATES Olt ldlt tlllt.

CORNELIUS F. SULLIVAN, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO FRANK W. LOWE, OF BOSTON, MASSACHU SETTS.

TOOL-SHANK.

Specification of Letters Patent.

Application filed September 14, 1908.

Patented July 13, 1909.

Serial No. 452,968.

To all whom it may concern:

Be it known that I, Oonxnmns F. SULLI- VAN, of Boston, county of Suffolk, State of Massachusetts, have invented an Improve ment in Tool-Shanks, of which the following is a specification.

This invention relates to certain improvements in the construction of the portion of the shank of a tool which is adapted to be inserted in an ordinary handle, and particularly in the means for retaining the tool therein.

It. has been customary to form the inserted portion of a tool shank in various ways for the purpose of causing it to be retained in the wood, one of which is to form corrugations on the shank. I have found, however, that the corrugations, when thus arranged, will cut away the wood at the sides of the hole which is bored in the handle to receive the shank, when it is driven in, so that the hole is enlarged to an extent corresponding to the extent which the corru gations project, with the result that they are practically ineflective.

lVith tools of certain kinds, such as screwdrivers, it is necessary that they be held from turning in the handle as well as from being withdrawn, and the object of my invention is to form a tool shank, so that it will be securely held in a wooden handle, both from turning and withdrawal. I accomplish this object by the means shown in the accompanying drawing, in which,

Figures 1 and 2 are top and side views of a screw-driver blade provided with my invention. Fig. 3 is an enlarged cross-sec tional view on the line 3 3 of Fig. 2. Fig. 4 is a view similar to Fig. 3, showing the shank within the wooden handle. Figs. 5 and 6 are longitudinal sections illustrating the action on the wood when the tool shank is being forced into place and after it has been Forced to the desired position.

According to my invention the shank a, which is shown as provided with a screw driver blade, has a pair of oppositely disposed, longitudinal flanges I) provided thereon, which are stamped out of the metal of the shank, by means of dies, said flanges extending transversely and beyond the line of the periphery thereof for a suitable distance. The opposite sides of each flange provided with a series of transverse ribs 0,

also formed in the dying operation, said ribs extending from the shank body outwardly. The edges of the flanges are provided with notches t) which are arranged opposite the ends of said rib 0, so that said ribs terminate at the bottoms of said notches. The distance from the bottom of one notch to the bottom of the opposite notch is somewhatgrcater than the diameter of the shank, so that said ribs will extend into the wood of the handle when inserted in the bore. Each of the ribs nearest the insertible end of the shank are arranged at a short distance from the adjacent end of its corresponding flange, so that there is a clear space therebetween. The handle (Z is provided with a longitudinal bore cl of the same diameter as the shank, so that the flanges t) are adapted to enter the wood at opposite sides of the shank.

When the shank is inserted in the bore ot the handle the ends of the flanges b will engage the wood of the handle at its ends, and, as the shank is forced into the bore, the flanges will plow the wood fibers to one side, the operation once started, being continued by the ribs 0, without cutting away any of the wood, as indicated in Fig. 5. After the shank has been driven as far as desirable into the handle, the wood fibers will spread back between the ribs 0 and into the notches o, securely holding the shank in place, as indicated in Figs. 1 and 6.

Having thus described my invention, what I claim as new and desire to secure by Let tcrs latent is l. A tool shank adapted to be inserted in the bore of a wooden handle, having a longitudinal flange extending transversely to enter the wood, said flange having a series of transverse engaging ribs on its side, substantially as described.

2. A tool shank adapted to be inserted in the bore of a wooden handle, having a pair of longitudinally extending flanges arranged diametrically opposite and extending transversely to enter the wood, said flanges having transverse engaging ribs on opposite sides thereot, substantially as described.

2-). A tool shank adapted to be inserted in the bore ot a wooden handle, having a longitudinal flange extending transversely to enter the wood, said flange having a series of notches at its edge and a series of transverse engaging ribs on its side extending from the bottoms of said notches, substantially as described.

4:. A tool shank adapted to be inserted in the bore of a Wooden handle, having a pair of longitudinally extending flanges arranged diametrically opposite and extending transversely to enter the Wood, said flanges each having a series of notches in their edges and a corresponding series of transverse engag- I 10 ing ribs on opposite sides thereof extending from the bottoins of said notches, substan= tially as described.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing Witnesses.

CORNELIUS F. SULLIVAN.

Witnesses H. B. DAVIS, L. H. HARRIMAN. 

